<!DOCTYPE html>
<html lang="zh-cn">
<head>
<style type="text/css">
.back{
	width: 1250px;
	height: 400px;
	background-image: url(./demo1.jpg);
	/*background-repeat: no-repeat;*/
	border: 1px solid green;
	margin-bottom: 6px;
	background-size:1250px 900px;
}
.important a {
	display: block;
   width: 900px;
   height: 120px;
   background-color: green;
}
.important a:hover{
	background-color: red;
}
.important img{
	display: block;
	width: 600px;
	height: 100px;
	background-color: #781563;
    background-image: url(./demo1.jpg);
    background-size:content;
}
</style>
</head>

<body>
<div  class="back">
</div>
<div class="important">
sdf 
<a>
 <img alt="我是demo" src="./demo2.png"/>
 </a>
 sdf
</div>

<!-- <li>
             <a title="" target="_blank" href="#">
                       <img alt="" style="background: url(../../image/bigindex/banner1.jpg); background-size:contain;" src="../../image/bigindex/alpha.png">                      
                   </a>
               </li>-->
</body>
</html>